#bg {
    position: fixed;
    width: 100%;
    height: 100vh;
    background: url('/static/img/bgi.jpg') no-repeat;
    background-size: cover;
    z-index: -1;

}

.content > h1 {
    color: white;
    text-align: center;
}

.main {
    width: 80%;
    margin: 30px auto;
    padding: 30px;
    background: white;
    border-radius: 15px;
}

.layui-btn {
    width: 105px;
    border-radius: 20px;
}

.layui-nav {
    opacity: 0.5;
}

